Telescopic support for drills



Dec. 20, 1938. J. P. scHNEBLY Y TELESCOPIC SUPPORT FOR DRILLS Filed Feb. 24, 1937 Patented Dec. 20, 1938 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to a drill and one object of the invention is to provide a drill of the motor driven type of such construction that it may be used in confined places such as when drilling openings in -beams, ceiling beams and other places where it would be difcult to apply pressure longitudinally of the drill during a drilling operation.

Another object of the invention is the provision of a drill wherein improved means has been provided for shifting a telescoping section of a standard longitudinally of a companion section, the said shifting means including a handle or lever projecting transversely of the standard in l such a position that it may be grasped and force exerted longitudinally of the standard.

It is another object of the invention to so construct and mount the shifting means that it may be adjusted to accommodate the standard to the distance between ceiling beams or ilanges of an I-beam and permit the necessary movement to be imparted to the telescoping sections of the standard during a drilling operation.

Another object of the invention is to provide the drill with improved means for releasing a bit from a chuck or hollow shaft forming an element of the drill after an opening has been formed.

The invention is illustrated in the accompanying drawing, wherein Figure l is a View showing the improved drill in side elevation and disposed in position to drill an opening in a flange of an I-beam shown in section.

Figure 2 is a sectional view taken longitudinally through the drill along the line 2 2 of Figure 1.

Figure 3 is a sectional view taken transversely through the drill along the line 3 3 of Figure 1.

This improved drill is of the motor driven type and has a standard I consisting of companion be referred to as upper and lower sections or as inner and outer sections. 'Ihe two sections are formed of metal tubes or pipe sections of the proper diameters to have telescoping engagement with each other and the lower section has its lower end portion internally threaded to receive a solid center point or plug 4 formed of hard metal and having a prong 5 tapered to a sharp point so that it may be engaged in a pit or indentation 6 formed in a :dange 'l of an I-beam 8 and prevent the standard from moving transversely out of the proper position during a drilling operation.

A gear casing 9 is mounted at the upper or outer end of the inner section 2 of the standard where it is held by an internally threaded neck IU having threaded engagement with the externally threaded end portion of the section 2. This casing has its upper end formed with a second neck II partially closed at its inner end and de` fining a cup in which a bearing I2 is mounted about a hollow shaft or chuck I3. This chuck extends into the gear-casing and -at its inner end carries a beveled gear I4 meshing with a-beveled gear l5 carried by one end of the drive shaft I6. The drive shaft constitutes the shaft of a motor I l and is rotatably mounted through the bearing I8. This bearing is mounted ina sleeve I9 extending between the motor and one side of the gear casing 9 and at the other end of the motor is a handle extension 2li intended to be grasped with one hand when using the drill. The motor may be of any conventional construction and operated by electricity, air, or in any other desired manner. Referring to Figure 2 it will be seen that the bore of the hollow shaft or chuck tapers towards its inner end and thus provides a socket 2| in which the tapered shank portion of a bit or drill 22 will have wedging fit and be caused to turn with the chuck. By providing the motor with the extension or handle, the drill can be held steady in an upright position when starting to drill an opening in the upper flange 23 of the I-beam and the cutting end of the drill maintained in the indentation 2li formed in this flange to mark the place where the opening is to be formed. By holding the handle or extension, the upper section may also be aided in its upward movement through the lower section of the standard.

During a drilling operation the upper section of the standard must be shifted upwardly and thus maintain the bit in cutting engagement with the I-beam, and, in order to do so, there has been provided a lever 25 having forks 26 at its inner end which straddle the upper section 2 and terminate in eyes 21 loosely engaged about pins 28 projecting from opposite sides of a ring 29. The ring lits loosely in a groove formed about a collar 30 carried by the upper section of the standard in a fixed position and, therefore, the lever can be shifted about the standard to a position in which it can be conveniently grasped by the operator of the drill. A series of openings 3I are formed in the lever and through one of the openings is passed a pin 32 serving to pivotally connect a link 33 with the lever. This link has its lower end pivotally mounted Abetween ears 34 of a sectional collar or clamp 35 which fits about the outer or lower section of the standard and is securely but releasably held in an adjusted 55 position vertically and circumferentially of the standard when the fastener passing through the ears 36 of the clamp is tightened. By applying pressure to the outer end of the lever it will be rocked about the pin connecting it with the upper end of the link and the upper section of the standard and the gear housing carried thereby will be shifted upwardly to force the cutting end of the bit into engagement with the ange of the I-beam and cause the bit to form an opening as it is turned. If the flanges of the I-beam are spaced from each other quite a long distance, the clamp will be shifted upwardly from the position shown in Figure 1 to such a position that the upper section may be shifted upwardly into position to bring the bit into contact with the flange to be drilled and still allow suiicient movement of the lever to apply the necessary pressure during a drilling operation.

When the opening has been formed, the pressure exerted will have caused the shank of the bit to have become very tightly wedged into the socket 2l. In order to permit the bit to be removed easily, there has been provided a rod or plunger 31 which is slidable longitudinally in the hollow standard and guided in its. sliding movement by bearing rings or bushings 3,8 mounted in the upper section of the standard. This plunger has its upper end portion tapered, as shown at 39, and terminates in a reduced end portion or pin 40 of such diameter that it may be slidably received in the inner end of the hollow shaft or chuck I3` and it will be readily understood that by telescoping the members 2 and 3` the plunger with its pin 40 will be forced into the inner end of the chuck striking the inner end of the bit and forcing the bit out of the chuck.

A drill has thus been provided which is so constructed that a hole can be easily drilled in a ange of an I-beam or through a ceiling beam or the like and the bit then easily removed.

Having thus described the invention, what is claimed as new is:

1. In a drill, a standard having hollow upper and lower telescoping sections, a housing carried by the upper end of the upper section, a chuck rotatably carried by said housing and extending vertically through the top thereof and formed with a vertical bore open at its inner and outer ends, means carried by said housing for imparting rotary motion to said chuck, means for shifting the sections longitudinally of each other and applying pressure to a bit mounted in said chuck to cause the bit to be fed to the work, bearings mounted in the upper section in spaced relation to each other longitudinally thereof ,and a plunger of greater length than either section of the standard slidable longitudinally in the standard through said bearings and having its lower end resting upon the bottom of the lower section and its upper end formed with a pin of a diameter adapting it to enter the inner end of the bore of the chuck and engage the inner end of a bit to force the bit out of the chuck when the drill is in an inverted position or disposed upright and the upper section of the standard reciprocated vertically and slid downwardly into the lower section a distance sufficient to cause the stem of the 'plunger to enter the lower end of the bore of said chuck and having striking engagement with the bit to dislodge the bit.

2. In a drill, a standard having a lower section and an upper section slidably telescoping into the lower section, a housing carried by the upper end of the upper section, a chuck rotatably mounted through the top of said housing and formed with a bit receiving socket, means carried by said housing for imparting rotary motio-n to said chuck, a collar mounted in a fixed position about said upper section, a ring rotatable about said collar, a lever pivoted to said ring and extending therefrom laterally of the upper section, a clamp carried by the lower section and adjustable longitudinally and circumferentially thereof, and a link extending longitudinally of said standard and pivoted at its lower end to the clamp and having its upper end pivoted to a predetermined intermediate portion of said lever and constituting a fulcrum for the lever whereby the lever may be rocked and shift the upper section upwardly to apply pressure to a bit mounted in the chuck.

JOHN PAUL SCHNEBLY. 

